// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org> * * Based on drivers/spmi/spmi.c: * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved. */ #include <linux/acpi.h>#include <linux/errno.h>#include <linux/idr.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/of.h>#include <linux/of_graph.h>#include <linux/of_device.h>#include <linux/pm_domain.h>#include <linux/pm_runtime.h>#include <linux/property.h>#include <linux/sched.h>#include <linux/serdev.h>#include <linux/slab.h> #include <linux/platform_data/x86/apple.h> static bool is_registered;static DEFINE_IDA(ctrl_ida); static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf){ int len; len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); if (len != -ENODEV) return len; return of_device_modalias(dev, buf, PAGE_SIZE);}static DEVICE_ATTR_RO(modalias); static struct attribute *serdev_device_attrs[] = { &dev_attr_modalias.attr, NULL,};ATTRIBUTE_GROUPS(serdev_device); static int serdev_device_uevent(const struct device *dev, struct kobj_uevent_env *env){ int rc; /* TODO: platform modalias */ rc = acpi_device_uevent_modalias(dev, env); if (rc != -ENODEV) return rc; return of_device_uevent_modalias(dev, env);} static void serdev_device_release(struct device *dev){ struct serdev_device *serdev = to_serdev_device(dev); kfree(serdev);} static const struct device_type serdev_device_type = { .groups = serdev_device_groups, .uevent = serdev_device_uevent, .release = serdev_device_release,}; static bool is_serdev_device(const struct device *dev){ return dev->type == &serdev_device_type;} static void serdev_ctrl_release(struct device *dev){ struct serdev_controller *ctrl = to_serdev_controller(dev); ida_free(&ctrl_ida, ctrl->nr); kfree(ctrl);} static const struct device_type serdev_ctrl_type = { .release = serdev_ctrl_release,}; static int serdev_device_match(struct device *dev, const struct device_driver *drv){ if (!is_serdev_device(dev)) return 0; /* TODO: platform matching */ if (acpi_driver_match_device(dev, drv)) return 1; return of_driver_match_device(dev, drv);} /** * serdev_device_add() - add a device previously constructed via serdev_device_alloc() * @serdev: serdev_device to be added */int serdev_device_add(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; struct device *parent = serdev->dev.parent; int err; dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr); /* Only a single slave device is currently supported. */ if (ctrl->serdev) { dev_err(&serdev->dev, "controller busy\n"); return -EBUSY; } ctrl->serdev = serdev; err = device_add(&serdev->dev); if (err < 0) { dev_err(&serdev->dev, "Failed to add serdev: %d\n", err); goto err_clear_serdev; } dev_dbg(&serdev->dev, "serdev registered successfully\n"); return 0; err_clear_serdev: ctrl->serdev = NULL; return err;}EXPORT_SYMBOL_GPL(serdev_device_add); /** * serdev_device_remove(): remove an serdev device * @serdev: serdev_device to be removed */void serdev_device_remove(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; device_unregister(&serdev->dev); ctrl->serdev = NULL;}EXPORT_SYMBOL_GPL(serdev_device_remove); int serdev_device_open(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; int ret; if (!ctrl || !ctrl->ops->open) return -EINVAL; ret = ctrl->ops->open(ctrl); if (ret) return ret; ret = pm_runtime_get_sync(&ctrl->dev); if (ret < 0) { pm_runtime_put_noidle(&ctrl->dev); goto err_close; } return 0; err_close: if (ctrl->ops->close) ctrl->ops->close(ctrl); return ret;}EXPORT_SYMBOL_GPL(serdev_device_open); void serdev_device_close(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->close) return; pm_runtime_put(&ctrl->dev); ctrl->ops->close(ctrl);}EXPORT_SYMBOL_GPL(serdev_device_close); static void devm_serdev_device_close(void *serdev){ serdev_device_close(serdev);} int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev){ int ret; ret = serdev_device_open(serdev); if (ret) return ret; return devm_add_action_or_reset(dev, devm_serdev_device_close, serdev);}EXPORT_SYMBOL_GPL(devm_serdev_device_open); void serdev_device_write_wakeup(struct serdev_device *serdev){ complete(&serdev->write_comp);}EXPORT_SYMBOL_GPL(serdev_device_write_wakeup); /** * serdev_device_write_buf() - write data asynchronously * @serdev: serdev device * @buf: data to be written * @count: number of bytes to write * * Write data to the device asynchronously. * * Note that any accepted data has only been buffered by the controller; use * serdev_device_wait_until_sent() to make sure the controller write buffer * has actually been emptied. * * Return: The number of bytes written (less than count if not enough room in * the write buffer), or a negative errno on errors. */int serdev_device_write_buf(struct serdev_device *serdev, const u8 *buf, size_t count){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->write_buf) return -EINVAL; return ctrl->ops->write_buf(ctrl, buf, count);}EXPORT_SYMBOL_GPL(serdev_device_write_buf); /** * serdev_device_write() - write data synchronously * @serdev: serdev device * @buf: data to be written * @count: number of bytes to write * @timeout: timeout in jiffies, or 0 to wait indefinitely * * Write data to the device synchronously by repeatedly calling * serdev_device_write() until the controller has accepted all data (unless * interrupted by a timeout or a signal). * * Note that any accepted data has only been buffered by the controller; use * serdev_device_wait_until_sent() to make sure the controller write buffer * has actually been emptied. * * Note that this function depends on serdev_device_write_wakeup() being * called in the serdev driver write_wakeup() callback. * * Return: The number of bytes written (less than count if interrupted), * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or * a negative errno on errors. */ssize_t serdev_device_write(struct serdev_device *serdev, const u8 *buf, size_t count, long timeout){ struct serdev_controller *ctrl = serdev->ctrl; size_t written = 0; ssize_t ret; if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup) return -EINVAL; if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; mutex_lock(&serdev->write_lock); do { reinit_completion(&serdev->write_comp); ret = ctrl->ops->write_buf(ctrl, buf, count); if (ret < 0) break; written += ret; buf += ret; count -= ret; if (count == 0) break; timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp, timeout); } while (timeout > 0); mutex_unlock(&serdev->write_lock); if (ret < 0) return ret; if (timeout <= 0 && written == 0) { if (timeout == -ERESTARTSYS) return -ERESTARTSYS; else return -ETIMEDOUT; } return written;}EXPORT_SYMBOL_GPL(serdev_device_write); void serdev_device_write_flush(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->write_flush) return; ctrl->ops->write_flush(ctrl);}EXPORT_SYMBOL_GPL(serdev_device_write_flush); unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_baudrate) return 0; return ctrl->ops->set_baudrate(ctrl, speed); }EXPORT_SYMBOL_GPL(serdev_device_set_baudrate); void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_flow_control) return; ctrl->ops->set_flow_control(ctrl, enable);}EXPORT_SYMBOL_GPL(serdev_device_set_flow_control); int serdev_device_set_parity(struct serdev_device *serdev, enum serdev_parity parity){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_parity) return -EOPNOTSUPP; return ctrl->ops->set_parity(ctrl, parity);}EXPORT_SYMBOL_GPL(serdev_device_set_parity); void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->wait_until_sent) return; ctrl->ops->wait_until_sent(ctrl, timeout);}EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent); int serdev_device_get_tiocm(struct serdev_device *serdev){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->get_tiocm) return -EOPNOTSUPP; return ctrl->ops->get_tiocm(ctrl);}EXPORT_SYMBOL_GPL(serdev_device_get_tiocm); int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_tiocm) return -EOPNOTSUPP; return ctrl->ops->set_tiocm(ctrl, set, clear);}EXPORT_SYMBOL_GPL(serdev_device_set_tiocm); int serdev_device_break_ctl(struct serdev_device *serdev, int break_state){ struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->break_ctl) return -EOPNOTSUPP; return ctrl->ops->break_ctl(ctrl, break_state);}EXPORT_SYMBOL_GPL(serdev_device_break_ctl); static int serdev_drv_probe(struct device *dev){ const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); int ret; ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON | PD_FLAG_DETACH_POWER_OFF); if (ret) return ret; return sdrv->probe(to_serdev_device(dev));} static void serdev_drv_remove(struct device *dev){ const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); if (sdrv->remove) sdrv->remove(to_serdev_device(dev));} static void serdev_drv_shutdown(struct device *dev){ const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); if (dev->driver && sdrv->shutdown) sdrv->shutdown(to_serdev_device(dev));} static const struct bus_type serdev_bus_type = { .name = "serial", .match = serdev_device_match, .probe = serdev_drv_probe, .remove = serdev_drv_remove, .shutdown = serdev_drv_shutdown,}; /** * serdev_device_alloc() - Allocate a new serdev device * @ctrl: associated controller * * Caller is responsible for either calling serdev_device_add() to add the * newly allocated controller, or calling serdev_device_put() to discard it. */struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl){ struct serdev_device *serdev; serdev = kzalloc_obj(*serdev); if (!serdev) return NULL; serdev->ctrl = ctrl; device_initialize(&serdev->dev); serdev->dev.parent = &ctrl->dev; serdev->dev.bus = &serdev_bus_type; serdev->dev.type = &serdev_device_type; init_completion(&serdev->write_comp); mutex_init(&serdev->write_lock); return serdev;}EXPORT_SYMBOL_GPL(serdev_device_alloc); /** * serdev_controller_alloc() - Allocate a new serdev controller * @host: serial port hardware controller device * @parent: parent device * @size: size of private data * * Caller is responsible for either calling serdev_controller_add() to add the * newly allocated controller, or calling serdev_controller_put() to discard it. * The allocated private data region may be accessed via * serdev_controller_get_drvdata() */struct serdev_controller *serdev_controller_alloc(struct device *host, struct device *parent, size_t size){ struct serdev_controller *ctrl; int id; if (WARN_ON(!parent)) return NULL; ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL); if (!ctrl) return NULL; id = ida_alloc(&ctrl_ida, GFP_KERNEL); if (id < 0) { dev_err(parent, "unable to allocate serdev controller identifier.\n"); goto err_free; } ctrl->nr = id; device_initialize(&ctrl->dev); ctrl->dev.type = &serdev_ctrl_type; ctrl->dev.bus = &serdev_bus_type; ctrl->dev.parent = parent; ctrl->host = host; device_set_node(&ctrl->dev, dev_fwnode(host));Lines 1–500 of 907. Load more
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org> * * Based on drivers/spmi/spmi.c: * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved. */ #include <linux/acpi.h> #include <linux/errno.h> #include <linux/idr.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_graph.h> #include <linux/of_device.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/sched.h> #include <linux/serdev.h> #include <linux/slab.h> #include <linux/platform_data/x86/apple.h> static bool is_registered; static DEFINE_IDA(ctrl_ida); static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { int len; len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); if (len != -ENODEV) return len; return of_device_modalias(dev, buf, PAGE_SIZE); } static DEVICE_ATTR_RO(modalias); static struct attribute *serdev_device_attrs[] = { &dev_attr_modalias.attr, NULL, }; ATTRIBUTE_GROUPS(serdev_device); static int serdev_device_uevent(const struct device *dev, struct kobj_uevent_env *env) { int rc; /* TODO: platform modalias */ rc = acpi_device_uevent_modalias(dev, env); if (rc != -ENODEV) return rc; return of_device_uevent_modalias(dev, env); } static void serdev_device_release(struct device *dev) { struct serdev_device *serdev = to_serdev_device(dev); kfree(serdev); } static const struct device_type serdev_device_type = { .groups = serdev_device_groups, .uevent = serdev_device_uevent, .release = serdev_device_release, }; static bool is_serdev_device(const struct device *dev) { return dev->type == &serdev_device_type; } static void serdev_ctrl_release(struct device *dev) { struct serdev_controller *ctrl = to_serdev_controller(dev); ida_free(&ctrl_ida, ctrl->nr); kfree(ctrl); } static const struct device_type serdev_ctrl_type = { .release = serdev_ctrl_release, }; static int serdev_device_match(struct device *dev, const struct device_driver *drv) { if (!is_serdev_device(dev)) return 0; /* TODO: platform matching */ if (acpi_driver_match_device(dev, drv)) return 1; return of_driver_match_device(dev, drv); } /** * serdev_device_add() - add a device previously constructed via serdev_device_alloc() * @serdev: serdev_device to be added */ int serdev_device_add(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; struct device *parent = serdev->dev.parent; int err; dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr); /* Only a single slave device is currently supported. */ if (ctrl->serdev) { dev_err(&serdev->dev, "controller busy\n"); return -EBUSY; } ctrl->serdev = serdev; err = device_add(&serdev->dev); if (err < 0) { dev_err(&serdev->dev, "Failed to add serdev: %d\n", err); goto err_clear_serdev; } dev_dbg(&serdev->dev, "serdev registered successfully\n"); return 0; err_clear_serdev: ctrl->serdev = NULL; return err; } EXPORT_SYMBOL_GPL(serdev_device_add); /** * serdev_device_remove(): remove an serdev device * @serdev: serdev_device to be removed */ void serdev_device_remove(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; device_unregister(&serdev->dev); ctrl->serdev = NULL; } EXPORT_SYMBOL_GPL(serdev_device_remove); int serdev_device_open(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; int ret; if (!ctrl || !ctrl->ops->open) return -EINVAL; ret = ctrl->ops->open(ctrl); if (ret) return ret; ret = pm_runtime_get_sync(&ctrl->dev); if (ret < 0) { pm_runtime_put_noidle(&ctrl->dev); goto err_close; } return 0; err_close: if (ctrl->ops->close) ctrl->ops->close(ctrl); return ret; } EXPORT_SYMBOL_GPL(serdev_device_open); void serdev_device_close(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->close) return; pm_runtime_put(&ctrl->dev); ctrl->ops->close(ctrl); } EXPORT_SYMBOL_GPL(serdev_device_close); static void devm_serdev_device_close(void *serdev) { serdev_device_close(serdev); } int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev) { int ret; ret = serdev_device_open(serdev); if (ret) return ret; return devm_add_action_or_reset(dev, devm_serdev_device_close, serdev); } EXPORT_SYMBOL_GPL(devm_serdev_device_open); void serdev_device_write_wakeup(struct serdev_device *serdev) { complete(&serdev->write_comp); } EXPORT_SYMBOL_GPL(serdev_device_write_wakeup); /** * serdev_device_write_buf() - write data asynchronously * @serdev: serdev device * @buf: data to be written * @count: number of bytes to write * * Write data to the device asynchronously. * * Note that any accepted data has only been buffered by the controller; use * serdev_device_wait_until_sent() to make sure the controller write buffer * has actually been emptied. * * Return: The number of bytes written (less than count if not enough room in * the write buffer), or a negative errno on errors. */ int serdev_device_write_buf(struct serdev_device *serdev, const u8 *buf, size_t count) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->write_buf) return -EINVAL; return ctrl->ops->write_buf(ctrl, buf, count); } EXPORT_SYMBOL_GPL(serdev_device_write_buf); /** * serdev_device_write() - write data synchronously * @serdev: serdev device * @buf: data to be written * @count: number of bytes to write * @timeout: timeout in jiffies, or 0 to wait indefinitely * * Write data to the device synchronously by repeatedly calling * serdev_device_write() until the controller has accepted all data (unless * interrupted by a timeout or a signal). * * Note that any accepted data has only been buffered by the controller; use * serdev_device_wait_until_sent() to make sure the controller write buffer * has actually been emptied. * * Note that this function depends on serdev_device_write_wakeup() being * called in the serdev driver write_wakeup() callback. * * Return: The number of bytes written (less than count if interrupted), * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or * a negative errno on errors. */ ssize_t serdev_device_write(struct serdev_device *serdev, const u8 *buf, size_t count, long timeout) { struct serdev_controller *ctrl = serdev->ctrl; size_t written = 0; ssize_t ret; if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup) return -EINVAL; if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; mutex_lock(&serdev->write_lock); do { reinit_completion(&serdev->write_comp); ret = ctrl->ops->write_buf(ctrl, buf, count); if (ret < 0) break; written += ret; buf += ret; count -= ret; if (count == 0) break; timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp, timeout); } while (timeout > 0); mutex_unlock(&serdev->write_lock); if (ret < 0) return ret; if (timeout <= 0 && written == 0) { if (timeout == -ERESTARTSYS) return -ERESTARTSYS; else return -ETIMEDOUT; } return written; } EXPORT_SYMBOL_GPL(serdev_device_write); void serdev_device_write_flush(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->write_flush) return; ctrl->ops->write_flush(ctrl); } EXPORT_SYMBOL_GPL(serdev_device_write_flush); unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_baudrate) return 0; return ctrl->ops->set_baudrate(ctrl, speed); } EXPORT_SYMBOL_GPL(serdev_device_set_baudrate); void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_flow_control) return; ctrl->ops->set_flow_control(ctrl, enable); } EXPORT_SYMBOL_GPL(serdev_device_set_flow_control); int serdev_device_set_parity(struct serdev_device *serdev, enum serdev_parity parity) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_parity) return -EOPNOTSUPP; return ctrl->ops->set_parity(ctrl, parity); } EXPORT_SYMBOL_GPL(serdev_device_set_parity); void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->wait_until_sent) return; ctrl->ops->wait_until_sent(ctrl, timeout); } EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent); int serdev_device_get_tiocm(struct serdev_device *serdev) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->get_tiocm) return -EOPNOTSUPP; return ctrl->ops->get_tiocm(ctrl); } EXPORT_SYMBOL_GPL(serdev_device_get_tiocm); int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->set_tiocm) return -EOPNOTSUPP; return ctrl->ops->set_tiocm(ctrl, set, clear); } EXPORT_SYMBOL_GPL(serdev_device_set_tiocm); int serdev_device_break_ctl(struct serdev_device *serdev, int break_state) { struct serdev_controller *ctrl = serdev->ctrl; if (!ctrl || !ctrl->ops->break_ctl) return -EOPNOTSUPP; return ctrl->ops->break_ctl(ctrl, break_state); } EXPORT_SYMBOL_GPL(serdev_device_break_ctl); static int serdev_drv_probe(struct device *dev) { const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); int ret; ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON | PD_FLAG_DETACH_POWER_OFF); if (ret) return ret; return sdrv->probe(to_serdev_device(dev)); } static void serdev_drv_remove(struct device *dev) { const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); if (sdrv->remove) sdrv->remove(to_serdev_device(dev)); } static void serdev_drv_shutdown(struct device *dev) { const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); if (dev->driver && sdrv->shutdown) sdrv->shutdown(to_serdev_device(dev)); } static const struct bus_type serdev_bus_type = { .name = "serial", .match = serdev_device_match, .probe = serdev_drv_probe, .remove = serdev_drv_remove, .shutdown = serdev_drv_shutdown, }; /** * serdev_device_alloc() - Allocate a new serdev device * @ctrl: associated controller * * Caller is responsible for either calling serdev_device_add() to add the * newly allocated controller, or calling serdev_device_put() to discard it. */ struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl) { struct serdev_device *serdev; serdev = kzalloc_obj(*serdev); if (!serdev) return NULL; serdev->ctrl = ctrl; device_initialize(&serdev->dev); serdev->dev.parent = &ctrl->dev; serdev->dev.bus = &serdev_bus_type; serdev->dev.type = &serdev_device_type; init_completion(&serdev->write_comp); mutex_init(&serdev->write_lock); return serdev; } EXPORT_SYMBOL_GPL(serdev_device_alloc); /** * serdev_controller_alloc() - Allocate a new serdev controller * @host: serial port hardware controller device * @parent: parent device * @size: size of private data * * Caller is responsible for either calling serdev_controller_add() to add the * newly allocated controller, or calling serdev_controller_put() to discard it. * The allocated private data region may be accessed via * serdev_controller_get_drvdata() */ struct serdev_controller *serdev_controller_alloc(struct device *host, struct device *parent, size_t size) { struct serdev_controller *ctrl; int id; if (WARN_ON(!parent)) return NULL; ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL); if (!ctrl) return NULL; id = ida_alloc(&ctrl_ida, GFP_KERNEL); if (id < 0) { dev_err(parent, "unable to allocate serdev controller identifier.\n"); goto err_free; } ctrl->nr = id; device_initialize(&ctrl->dev); ctrl->dev.type = &serdev_ctrl_type; ctrl->dev.bus = &serdev_bus_type; ctrl->dev.parent = parent; ctrl->host = host; device_set_node(&ctrl->dev, dev_fwnode(host));